The observation that Tiktaalik had both gills and lungs suggests which of the following?
A. It could absorb both food and oxygen from the water.
B. It could absorb oxygen from both the air and water.
C. It could absorb food from the water.
D. It could absorb oxygen from the water.
E. It could absorb oxygen from the air.
B. It could absorb oxygen from both the air and water.
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Cyanide binds and impairs one of the molecules involved in the production of ATP. Which organelle does cyanide act upon?
A. peroxisome B. lysosome C. ribosome D. endoplasmic reticulum E. mitochondria
What is unique about reverse transcripatse that makes it different from other DNA polymerases?
A. It has ligase ability built in so host enzymes are not needed to seal up breaks in DNA made during replication. B. It manufactures a special tRNA molecule that it uses as a primer to initiate replication. C. It is found exclusively in DNA viruses. D. It lacks normal proofreading ability leading to many errors during replication.
Mitosis and meiosis are similar in that ________
a. enzymes that repair DNA damage are critical to both processes b. each forms a bipolar spindle c. each sorts duplicated chromosomes into daughter cells d. all of the choices
Which component of a negative feedback mechanism is responsible for producing the result that counteracts the original environmental change away from homeostasis?
a. an integrator b. a sensor c. an effector d. a stimulus